Use send options to send as a meeting request, request a return receipt, and choose a level of importance. You can also choose to include a Feedback link, mark as private email, or combine all attachments into a single PDF document. The final option here allows you to send this email to a rollup list by selecting that rollup from the dropdown

Attachments allows you to add files stored locally on your machine.

PCR Files allows you to choose global, name, position, or company attachments related to the record.